<p style="margin: 5px 5px 0px 5px;">
Here should be returned null since no type or return tag is available.
</p>
<h4 style="margin: 10px 0px 5px 0px">Throws:</h4>
<table style="margin-left: 10px;">
<tr>
<td></td>
<td valign="top">any exception which can throw Shape constructor</td>
</tr>
</table>
